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Research on HV Frequency Drive Technology for Clinker Sintered Alumina

Author: LiuJianHua
Tutor: ZouPing；LiuSiQing
School: Northeastern University
Course: Mechanical Engineering
Keywords: High-voltage inverter Sinusoidal pulse width modulation VVVF
CLC: TM921.51
Type: Master's thesis
Year: 2008
Downloads: 24
Quote: 0
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Abstract


Currently, the total installed capacity of China 's motor has reached more than 400 million kilowatts , the power consumption accounts for about 60% of the country's total electricity consumption . Large selection of capacity due to various margin considering the motor selection generally high energy-saving potential is huge . Thermal power plant in China , fans and pumps are usually high - voltage motor drive , rely on the regulation of the amount of wind baffles, flow regulation rely valve motor is always running at full speed , so that not only waste a lot of energy , but also to increase the pressure of the pipeline losses. Practice has proved that for fans, pumps and other fluid mechanical switch AC motor frequency control devices to regulate air flow and flow can save energy 20% -30% . In addition , statistics show that about 10% of motor failure is caused due to the start of the current and the winding is too large electromagnetic force . Can improve the startup performance through the transformation of variable frequency AC motor power , thus extending the service life of the motor , and lower production costs . For the above reasons and the actual needs , the paper obtained by matrix transformation mathematical model of the induction motor in the two -phase static and two-phase rotating coordinate system , so as to establish the mathematical model of the exhaust fan . The effects of combined resistance of the pipe network the fan class mechanical characteristic curve was amended simplified model . And drag the fan dynamic mathematical model derived motor simulation realized in MATLAB . Simulation results show that the simulation model can be more truly reflect the actual physical model of the motor , and has a higher credibility . Secondly, a detailed analysis of the high-voltage inverter topology transformer connection and operation mechanism . Third, the network side and the output side of the harmonic content of the voltage, current, made ??simulation analysis calculations. The results indicate that multiple rectifier makes the system harmonic pollution ; unit in series circuit structure makes the output voltage total harmonic distortion is small , the harm to the motor ; the output harmonic components increase with decreasing voltage modulation than ; full modular design , easy maintenance and simple . Finally, the MCU sinusoidal pulse width modulation and space vector pulse width modulation method , frequency control of asynchronous motors .

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CLC: > Industrial Technology > Electrotechnical > Electrification,electrical energy application > Electric drive ( electric drive ) > Control system > Variable frequency control system
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